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708 lines
23 KiB
708 lines
23 KiB
from __future__ import annotations
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from collections import namedtuple
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import re
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from typing import Any
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from typing import Callable
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from typing import Dict
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from typing import List
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from typing import Optional
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from typing import Sequence
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from typing import Set
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from typing import Tuple
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from typing import Type
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from typing import TYPE_CHECKING
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from typing import Union
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from sqlalchemy import cast
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from sqlalchemy import schema
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from sqlalchemy import text
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from . import base
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from .. import util
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from ..util import sqla_compat
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if TYPE_CHECKING:
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from typing import Literal
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from typing import TextIO
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from sqlalchemy.engine import Connection
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from sqlalchemy.engine import Dialect
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from sqlalchemy.engine.cursor import CursorResult
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from sqlalchemy.engine.reflection import Inspector
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from sqlalchemy.sql.elements import ClauseElement
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from sqlalchemy.sql.elements import ColumnElement
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from sqlalchemy.sql.elements import quoted_name
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from sqlalchemy.sql.schema import Column
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from sqlalchemy.sql.schema import Constraint
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from sqlalchemy.sql.schema import ForeignKeyConstraint
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from sqlalchemy.sql.schema import Index
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from sqlalchemy.sql.schema import Table
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from sqlalchemy.sql.schema import UniqueConstraint
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from sqlalchemy.sql.selectable import TableClause
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from sqlalchemy.sql.type_api import TypeEngine
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from .base import _ServerDefault
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from ..autogenerate.api import AutogenContext
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from ..operations.batch import ApplyBatchImpl
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from ..operations.batch import BatchOperationsImpl
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class ImplMeta(type):
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def __init__(
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cls,
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classname: str,
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bases: Tuple[Type[DefaultImpl]],
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dict_: Dict[str, Any],
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):
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newtype = type.__init__(cls, classname, bases, dict_)
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if "__dialect__" in dict_:
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_impls[dict_["__dialect__"]] = cls # type: ignore[assignment]
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return newtype
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_impls: Dict[str, Type[DefaultImpl]] = {}
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Params = namedtuple("Params", ["token0", "tokens", "args", "kwargs"])
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class DefaultImpl(metaclass=ImplMeta):
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"""Provide the entrypoint for major migration operations,
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including database-specific behavioral variances.
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While individual SQL/DDL constructs already provide
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for database-specific implementations, variances here
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allow for entirely different sequences of operations
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to take place for a particular migration, such as
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SQL Server's special 'IDENTITY INSERT' step for
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bulk inserts.
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"""
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__dialect__ = "default"
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transactional_ddl = False
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command_terminator = ";"
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type_synonyms: Tuple[Set[str], ...] = ({"NUMERIC", "DECIMAL"},)
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type_arg_extract: Sequence[str] = ()
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# on_null is known to be supported only by oracle
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identity_attrs_ignore: Tuple[str, ...] = ("on_null",)
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def __init__(
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self,
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dialect: Dialect,
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connection: Optional[Connection],
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as_sql: bool,
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transactional_ddl: Optional[bool],
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output_buffer: Optional[TextIO],
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context_opts: Dict[str, Any],
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) -> None:
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self.dialect = dialect
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self.connection = connection
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self.as_sql = as_sql
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self.literal_binds = context_opts.get("literal_binds", False)
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self.output_buffer = output_buffer
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self.memo: dict = {}
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self.context_opts = context_opts
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if transactional_ddl is not None:
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self.transactional_ddl = transactional_ddl
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if self.literal_binds:
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if not self.as_sql:
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raise util.CommandError(
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"Can't use literal_binds setting without as_sql mode"
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)
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@classmethod
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def get_by_dialect(cls, dialect: Dialect) -> Type[DefaultImpl]:
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return _impls[dialect.name]
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def static_output(self, text: str) -> None:
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assert self.output_buffer is not None
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self.output_buffer.write(text + "\n\n")
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self.output_buffer.flush()
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def requires_recreate_in_batch(
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self, batch_op: BatchOperationsImpl
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) -> bool:
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"""Return True if the given :class:`.BatchOperationsImpl`
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would need the table to be recreated and copied in order to
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proceed.
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Normally, only returns True on SQLite when operations other
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than add_column are present.
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"""
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return False
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def prep_table_for_batch(
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self, batch_impl: ApplyBatchImpl, table: Table
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) -> None:
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"""perform any operations needed on a table before a new
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one is created to replace it in batch mode.
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the PG dialect uses this to drop constraints on the table
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before the new one uses those same names.
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"""
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@property
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def bind(self) -> Optional[Connection]:
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return self.connection
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def _exec(
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self,
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construct: Union[ClauseElement, str],
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execution_options: Optional[dict] = None,
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multiparams: Sequence[dict] = (),
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params: Dict[str, int] = util.immutabledict(),
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) -> Optional[CursorResult]:
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if isinstance(construct, str):
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construct = text(construct)
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if self.as_sql:
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if multiparams or params:
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# TODO: coverage
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raise Exception("Execution arguments not allowed with as_sql")
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if self.literal_binds and not isinstance(
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construct, schema.DDLElement
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):
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compile_kw = dict(compile_kwargs={"literal_binds": True})
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else:
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compile_kw = {}
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compiled = construct.compile(
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dialect=self.dialect, **compile_kw # type: ignore[arg-type]
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)
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self.static_output(
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str(compiled).replace("\t", " ").strip()
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+ self.command_terminator
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)
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return None
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else:
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conn = self.connection
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assert conn is not None
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if execution_options:
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conn = conn.execution_options(**execution_options)
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if params:
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assert isinstance(multiparams, tuple)
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multiparams += (params,)
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return conn.execute( # type: ignore[call-overload]
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construct, multiparams
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)
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def execute(
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self,
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sql: Union[ClauseElement, str],
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execution_options: None = None,
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) -> None:
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self._exec(sql, execution_options)
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def alter_column(
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self,
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table_name: str,
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column_name: str,
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nullable: Optional[bool] = None,
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server_default: Union[_ServerDefault, Literal[False]] = False,
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name: Optional[str] = None,
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type_: Optional[TypeEngine] = None,
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schema: Optional[str] = None,
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autoincrement: Optional[bool] = None,
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comment: Optional[Union[str, Literal[False]]] = False,
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existing_comment: Optional[str] = None,
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existing_type: Optional[TypeEngine] = None,
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existing_server_default: Optional[_ServerDefault] = None,
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existing_nullable: Optional[bool] = None,
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existing_autoincrement: Optional[bool] = None,
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**kw: Any,
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) -> None:
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if autoincrement is not None or existing_autoincrement is not None:
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util.warn(
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"autoincrement and existing_autoincrement "
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"only make sense for MySQL",
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stacklevel=3,
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)
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if nullable is not None:
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self._exec(
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base.ColumnNullable(
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table_name,
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column_name,
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nullable,
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schema=schema,
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existing_type=existing_type,
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existing_server_default=existing_server_default,
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existing_nullable=existing_nullable,
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existing_comment=existing_comment,
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)
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)
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if server_default is not False:
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kw = {}
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cls_: Type[
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Union[
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base.ComputedColumnDefault,
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base.IdentityColumnDefault,
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base.ColumnDefault,
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]
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]
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if sqla_compat._server_default_is_computed(
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server_default, existing_server_default
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):
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cls_ = base.ComputedColumnDefault
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elif sqla_compat._server_default_is_identity(
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server_default, existing_server_default
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):
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cls_ = base.IdentityColumnDefault
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kw["impl"] = self
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else:
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cls_ = base.ColumnDefault
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self._exec(
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cls_(
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table_name,
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column_name,
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server_default, # type:ignore[arg-type]
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schema=schema,
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existing_type=existing_type,
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existing_server_default=existing_server_default,
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existing_nullable=existing_nullable,
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existing_comment=existing_comment,
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**kw,
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)
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)
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if type_ is not None:
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self._exec(
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base.ColumnType(
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table_name,
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column_name,
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type_,
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schema=schema,
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existing_type=existing_type,
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existing_server_default=existing_server_default,
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existing_nullable=existing_nullable,
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existing_comment=existing_comment,
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)
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)
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if comment is not False:
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self._exec(
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base.ColumnComment(
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table_name,
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column_name,
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comment,
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schema=schema,
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existing_type=existing_type,
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existing_server_default=existing_server_default,
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existing_nullable=existing_nullable,
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existing_comment=existing_comment,
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)
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)
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# do the new name last ;)
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if name is not None:
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self._exec(
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base.ColumnName(
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table_name,
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column_name,
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name,
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schema=schema,
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existing_type=existing_type,
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existing_server_default=existing_server_default,
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existing_nullable=existing_nullable,
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)
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)
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def add_column(
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self,
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table_name: str,
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column: Column,
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schema: Optional[Union[str, quoted_name]] = None,
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) -> None:
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self._exec(base.AddColumn(table_name, column, schema=schema))
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def drop_column(
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self,
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table_name: str,
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column: Column,
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schema: Optional[str] = None,
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**kw,
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) -> None:
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self._exec(base.DropColumn(table_name, column, schema=schema))
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def add_constraint(self, const: Any) -> None:
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if const._create_rule is None or const._create_rule(self):
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self._exec(schema.AddConstraint(const))
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def drop_constraint(self, const: Constraint) -> None:
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self._exec(schema.DropConstraint(const))
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def rename_table(
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self,
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old_table_name: str,
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new_table_name: Union[str, quoted_name],
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schema: Optional[Union[str, quoted_name]] = None,
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) -> None:
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self._exec(
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base.RenameTable(old_table_name, new_table_name, schema=schema)
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)
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def create_table(self, table: Table) -> None:
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table.dispatch.before_create(
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table, self.connection, checkfirst=False, _ddl_runner=self
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)
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self._exec(schema.CreateTable(table))
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table.dispatch.after_create(
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table, self.connection, checkfirst=False, _ddl_runner=self
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)
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for index in table.indexes:
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self._exec(schema.CreateIndex(index))
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with_comment = (
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self.dialect.supports_comments and not self.dialect.inline_comments
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)
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comment = table.comment
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if comment and with_comment:
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self.create_table_comment(table)
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for column in table.columns:
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comment = column.comment
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if comment and with_comment:
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self.create_column_comment(column)
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def drop_table(self, table: Table) -> None:
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table.dispatch.before_drop(
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table, self.connection, checkfirst=False, _ddl_runner=self
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)
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self._exec(schema.DropTable(table))
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table.dispatch.after_drop(
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table, self.connection, checkfirst=False, _ddl_runner=self
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)
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def create_index(self, index: Index) -> None:
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self._exec(schema.CreateIndex(index))
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def create_table_comment(self, table: Table) -> None:
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self._exec(schema.SetTableComment(table))
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def drop_table_comment(self, table: Table) -> None:
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self._exec(schema.DropTableComment(table))
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def create_column_comment(self, column: ColumnElement) -> None:
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self._exec(schema.SetColumnComment(column))
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def drop_index(self, index: Index) -> None:
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self._exec(schema.DropIndex(index))
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def bulk_insert(
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self,
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table: Union[TableClause, Table],
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rows: List[dict],
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multiinsert: bool = True,
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) -> None:
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if not isinstance(rows, list):
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raise TypeError("List expected")
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elif rows and not isinstance(rows[0], dict):
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raise TypeError("List of dictionaries expected")
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if self.as_sql:
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for row in rows:
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self._exec(
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sqla_compat._insert_inline(table).values(
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**{
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k: sqla_compat._literal_bindparam(
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k, v, type_=table.c[k].type
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)
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if not isinstance(
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v, sqla_compat._literal_bindparam
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)
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else v
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for k, v in row.items()
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}
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)
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)
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else:
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if rows:
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if multiinsert:
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self._exec(
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sqla_compat._insert_inline(table), multiparams=rows
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)
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else:
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for row in rows:
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self._exec(
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sqla_compat._insert_inline(table).values(**row)
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)
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def _tokenize_column_type(self, column: Column) -> Params:
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definition = self.dialect.type_compiler.process(column.type).lower()
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# tokenize the SQLAlchemy-generated version of a type, so that
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# the two can be compared.
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#
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# examples:
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# NUMERIC(10, 5)
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# TIMESTAMP WITH TIMEZONE
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# INTEGER UNSIGNED
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# INTEGER (10) UNSIGNED
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# INTEGER(10) UNSIGNED
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# varchar character set utf8
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#
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tokens = re.findall(r"[\w\-_]+|\(.+?\)", definition)
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term_tokens = []
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paren_term = None
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for token in tokens:
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if re.match(r"^\(.*\)$", token):
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paren_term = token
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else:
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term_tokens.append(token)
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params = Params(term_tokens[0], term_tokens[1:], [], {})
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|
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if paren_term:
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for term in re.findall("[^(),]+", paren_term):
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if "=" in term:
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key, val = term.split("=")
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params.kwargs[key.strip()] = val.strip()
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else:
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params.args.append(term.strip())
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return params
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|
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def _column_types_match(
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self, inspector_params: Params, metadata_params: Params
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) -> bool:
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if inspector_params.token0 == metadata_params.token0:
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return True
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|
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synonyms = [{t.lower() for t in batch} for batch in self.type_synonyms]
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inspector_all_terms = " ".join(
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[inspector_params.token0] + inspector_params.tokens
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)
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metadata_all_terms = " ".join(
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[metadata_params.token0] + metadata_params.tokens
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)
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for batch in synonyms:
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if {inspector_all_terms, metadata_all_terms}.issubset(batch) or {
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inspector_params.token0,
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metadata_params.token0,
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}.issubset(batch):
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return True
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return False
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|
|
def _column_args_match(
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self, inspected_params: Params, meta_params: Params
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) -> bool:
|
|
"""We want to compare column parameters. However, we only want
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to compare parameters that are set. If they both have `collation`,
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we want to make sure they are the same. However, if only one
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specifies it, dont flag it for being less specific
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"""
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|
|
if (
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len(meta_params.tokens) == len(inspected_params.tokens)
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and meta_params.tokens != inspected_params.tokens
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):
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return False
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|
|
|
if (
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len(meta_params.args) == len(inspected_params.args)
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|
and meta_params.args != inspected_params.args
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|
):
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|
return False
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|
|
|
insp = " ".join(inspected_params.tokens).lower()
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|
meta = " ".join(meta_params.tokens).lower()
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|
|
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for reg in self.type_arg_extract:
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mi = re.search(reg, insp)
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mm = re.search(reg, meta)
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if mi and mm and mi.group(1) != mm.group(1):
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return False
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return True
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|
|
def compare_type(
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|
self, inspector_column: Column, metadata_column: Column
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) -> bool:
|
|
"""Returns True if there ARE differences between the types of the two
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columns. Takes impl.type_synonyms into account between retrospected
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and metadata types
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"""
|
|
inspector_params = self._tokenize_column_type(inspector_column)
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metadata_params = self._tokenize_column_type(metadata_column)
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if not self._column_types_match(inspector_params, metadata_params):
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return True
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|
if not self._column_args_match(inspector_params, metadata_params):
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return True
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|
return False
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|
|
def compare_server_default(
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|
self,
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inspector_column,
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metadata_column,
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|
rendered_metadata_default,
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rendered_inspector_default,
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):
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return rendered_inspector_default != rendered_metadata_default
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|
|
def correct_for_autogen_constraints(
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|
self,
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|
conn_uniques: Set[UniqueConstraint],
|
|
conn_indexes: Set[Index],
|
|
metadata_unique_constraints: Set[UniqueConstraint],
|
|
metadata_indexes: Set[Index],
|
|
) -> None:
|
|
pass
|
|
|
|
def cast_for_batch_migrate(self, existing, existing_transfer, new_type):
|
|
if existing.type._type_affinity is not new_type._type_affinity:
|
|
existing_transfer["expr"] = cast(
|
|
existing_transfer["expr"], new_type
|
|
)
|
|
|
|
def render_ddl_sql_expr(
|
|
self, expr: ClauseElement, is_server_default: bool = False, **kw: Any
|
|
) -> str:
|
|
"""Render a SQL expression that is typically a server default,
|
|
index expression, etc.
|
|
|
|
.. versionadded:: 1.0.11
|
|
|
|
"""
|
|
|
|
compile_kw = {
|
|
"compile_kwargs": {"literal_binds": True, "include_table": False}
|
|
}
|
|
return str(
|
|
expr.compile(
|
|
dialect=self.dialect, **compile_kw # type: ignore[arg-type]
|
|
)
|
|
)
|
|
|
|
def _compat_autogen_column_reflect(self, inspector: Inspector) -> Callable:
|
|
return self.autogen_column_reflect
|
|
|
|
def correct_for_autogen_foreignkeys(
|
|
self,
|
|
conn_fks: Set[ForeignKeyConstraint],
|
|
metadata_fks: Set[ForeignKeyConstraint],
|
|
) -> None:
|
|
pass
|
|
|
|
def autogen_column_reflect(self, inspector, table, column_info):
|
|
"""A hook that is attached to the 'column_reflect' event for when
|
|
a Table is reflected from the database during the autogenerate
|
|
process.
|
|
|
|
Dialects can elect to modify the information gathered here.
|
|
|
|
"""
|
|
|
|
def start_migrations(self) -> None:
|
|
"""A hook called when :meth:`.EnvironmentContext.run_migrations`
|
|
is called.
|
|
|
|
Implementations can set up per-migration-run state here.
|
|
|
|
"""
|
|
|
|
def emit_begin(self) -> None:
|
|
"""Emit the string ``BEGIN``, or the backend-specific
|
|
equivalent, on the current connection context.
|
|
|
|
This is used in offline mode and typically
|
|
via :meth:`.EnvironmentContext.begin_transaction`.
|
|
|
|
"""
|
|
self.static_output("BEGIN" + self.command_terminator)
|
|
|
|
def emit_commit(self) -> None:
|
|
"""Emit the string ``COMMIT``, or the backend-specific
|
|
equivalent, on the current connection context.
|
|
|
|
This is used in offline mode and typically
|
|
via :meth:`.EnvironmentContext.begin_transaction`.
|
|
|
|
"""
|
|
self.static_output("COMMIT" + self.command_terminator)
|
|
|
|
def render_type(
|
|
self, type_obj: TypeEngine, autogen_context: AutogenContext
|
|
) -> Union[str, Literal[False]]:
|
|
return False
|
|
|
|
def _compare_identity_default(self, metadata_identity, inspector_identity):
|
|
|
|
# ignored contains the attributes that were not considered
|
|
# because assumed to their default values in the db.
|
|
diff, ignored = _compare_identity_options(
|
|
sqla_compat._identity_attrs,
|
|
metadata_identity,
|
|
inspector_identity,
|
|
sqla_compat.Identity(),
|
|
)
|
|
|
|
meta_always = getattr(metadata_identity, "always", None)
|
|
inspector_always = getattr(inspector_identity, "always", None)
|
|
# None and False are the same in this comparison
|
|
if bool(meta_always) != bool(inspector_always):
|
|
diff.add("always")
|
|
|
|
diff.difference_update(self.identity_attrs_ignore)
|
|
|
|
# returns 3 values:
|
|
return (
|
|
# different identity attributes
|
|
diff,
|
|
# ignored identity attributes
|
|
ignored,
|
|
# if the two identity should be considered different
|
|
bool(diff) or bool(metadata_identity) != bool(inspector_identity),
|
|
)
|
|
|
|
def create_index_sig(self, index: Index) -> Tuple[Any, ...]:
|
|
# order of col matters in an index
|
|
return tuple(col.name for col in index.columns)
|
|
|
|
def _skip_functional_indexes(self, metadata_indexes, conn_indexes):
|
|
conn_indexes_by_name = {c.name: c for c in conn_indexes}
|
|
|
|
for idx in list(metadata_indexes):
|
|
if idx.name in conn_indexes_by_name:
|
|
continue
|
|
iex = sqla_compat.is_expression_index(idx)
|
|
if iex:
|
|
util.warn(
|
|
"autogenerate skipping metadata-specified "
|
|
"expression-based index "
|
|
f"{idx.name!r}; dialect {self.__dialect__!r} under "
|
|
f"SQLAlchemy {sqla_compat.sqlalchemy_version} can't "
|
|
"reflect these indexes so they can't be compared"
|
|
)
|
|
metadata_indexes.discard(idx)
|
|
|
|
|
|
def _compare_identity_options(
|
|
attributes, metadata_io, inspector_io, default_io
|
|
):
|
|
# this can be used for identity or sequence compare.
|
|
# default_io is an instance of IdentityOption with all attributes to the
|
|
# default value.
|
|
diff = set()
|
|
ignored_attr = set()
|
|
for attr in attributes:
|
|
meta_value = getattr(metadata_io, attr, None)
|
|
default_value = getattr(default_io, attr, None)
|
|
conn_value = getattr(inspector_io, attr, None)
|
|
if conn_value != meta_value:
|
|
if meta_value == default_value:
|
|
ignored_attr.add(attr)
|
|
else:
|
|
diff.add(attr)
|
|
return diff, ignored_attr
|